14-df0018wm cmos checksum error

[IdkWhyIdid]

Hello everyone,

Recently my old HP laptop 14-df0018wm showed the CMOS checksum error screen again. This happened in August 2024, when I wanted to use it while my current laptop was in repair, and I let the battery discharge fully. A few days later, I tried turning it on, it showed the error.

November 2024: I turn the laptop back on and it completely works. I replaced the default windows 10 installation with Kubuntu. Everything was going smoothly.

Now: I pull the laptop out again and it shows the CMOS checksum error again. One part I left out, is that a few weeks ago, I opened up the laptop to see if I could put an M.2 in it. I get easily startled by BIOS speaker beeps so I took the battery out. When I re-assembled it, I put the battery back in. Also, a plastic piece came off of the battery, but I don't think it mattered. I tried to turn it on yesterday to customize KDE Plasma and it showed the CMOS checksum error again. Am I able to turn it on and have it run like normal? How do I get rid of this error?

[Garp_senchau]

@IdkWhyIdid, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

The are two main reasons a BIOS test fails:

The battery on the system board has lost its ability to supply power.

The BIOS was updated incorrectly.

I suggest you refer this guide: HP Desktop PCs - Resolve BIOS ROM or CMOS checksum error | HP® Support

I hope these steps help resolve the issue

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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Regards,